Smart cities are a model of urbanism that aims to make urban life more sustainable, efficient and livable by using technological innovations. Technologies such as big data analytics, artificial intelligence, the Internet of Things and cloud computing enable fast and efficient delivery of public services, while creating comprehensive transformations in areas such as transportation, energy management and environmental sustainability. In particular, real-time data analytics and digital platforms create a more transparent and participatory structure in city management, while blockchain and cyber security solutions strengthen data security. In addition, smart transportation systems optimize traffic flow and reduce time loss, while autonomous and electric vehicles promote environmentally friendly transportation. For a sustainable city life, the use of renewable energy sources, the expansion of energy-efficient buildings and smart waste management practices are of great importance. In order to successfully realize all these developments, public and private sector cooperation should be strengthened, innovative financing models should be implemented, and smart infrastructures should be continuously developed. In conclusion, smart cities, shaped by a data-driven, participatory and human-centered management approach, offer innovative public services and create more economically, environmentally and socially sustainable cities.